| //===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This contains code to emit Decl nodes as LLVM code. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "CGDebugInfo.h" |
| #include "CodeGenFunction.h" |
| #include "CodeGenModule.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/CharUnits.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/AST/DeclObjC.h" |
| #include "clang/Basic/SourceManager.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "clang/CodeGen/CodeGenOptions.h" |
| #include "llvm/GlobalVariable.h" |
| #include "llvm/Intrinsics.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Type.h" |
| using namespace clang; |
| using namespace CodeGen; |
| |
| |
| void CodeGenFunction::EmitDecl(const Decl &D) { |
| switch (D.getKind()) { |
| case Decl::TranslationUnit: |
| case Decl::Namespace: |
| case Decl::UnresolvedUsingTypename: |
| case Decl::ClassTemplateSpecialization: |
| case Decl::ClassTemplatePartialSpecialization: |
| case Decl::TemplateTypeParm: |
| case Decl::UnresolvedUsingValue: |
| case Decl::NonTypeTemplateParm: |
| case Decl::CXXMethod: |
| case Decl::CXXConstructor: |
| case Decl::CXXDestructor: |
| case Decl::CXXConversion: |
| case Decl::Field: |
| case Decl::ObjCIvar: |
| case Decl::ObjCAtDefsField: |
| case Decl::ParmVar: |
| case Decl::ImplicitParam: |
| case Decl::ClassTemplate: |
| case Decl::FunctionTemplate: |
| case Decl::TemplateTemplateParm: |
| case Decl::ObjCMethod: |
| case Decl::ObjCCategory: |
| case Decl::ObjCProtocol: |
| case Decl::ObjCInterface: |
| case Decl::ObjCCategoryImpl: |
| case Decl::ObjCImplementation: |
| case Decl::ObjCProperty: |
| case Decl::ObjCCompatibleAlias: |
| case Decl::LinkageSpec: |
| case Decl::ObjCPropertyImpl: |
| case Decl::ObjCClass: |
| case Decl::ObjCForwardProtocol: |
| case Decl::FileScopeAsm: |
| case Decl::Friend: |
| case Decl::FriendTemplate: |
| case Decl::Block: |
| |
| assert(0 && "Declaration not should not be in declstmts!"); |
| case Decl::Function: // void X(); |
| case Decl::Record: // struct/union/class X; |
| case Decl::Enum: // enum X; |
| case Decl::EnumConstant: // enum ? { X = ? } |
| case Decl::CXXRecord: // struct/union/class X; [C++] |
| case Decl::Using: // using X; [C++] |
| case Decl::UsingShadow: |
| case Decl::UsingDirective: // using namespace X; [C++] |
| case Decl::NamespaceAlias: |
| case Decl::StaticAssert: // static_assert(X, ""); [C++0x] |
| // None of these decls require codegen support. |
| return; |
| |
| case Decl::Var: { |
| const VarDecl &VD = cast<VarDecl>(D); |
| assert(VD.isBlockVarDecl() && |
| "Should not see file-scope variables inside a function!"); |
| return EmitBlockVarDecl(VD); |
| } |
| |
| case Decl::Typedef: { // typedef int X; |
| const TypedefDecl &TD = cast<TypedefDecl>(D); |
| QualType Ty = TD.getUnderlyingType(); |
| |
| if (Ty->isVariablyModifiedType()) |
| EmitVLASize(Ty); |
| } |
| } |
| } |
| |
| /// EmitBlockVarDecl - This method handles emission of any variable declaration |
| /// inside a function, including static vars etc. |
| void CodeGenFunction::EmitBlockVarDecl(const VarDecl &D) { |
| if (D.hasAttr<AsmLabelAttr>()) |
| CGM.ErrorUnsupported(&D, "__asm__"); |
| |
| switch (D.getStorageClass()) { |
| case VarDecl::None: |
| case VarDecl::Auto: |
| case VarDecl::Register: |
| return EmitLocalBlockVarDecl(D); |
| case VarDecl::Static: { |
| llvm::GlobalValue::LinkageTypes Linkage = |
| llvm::GlobalValue::InternalLinkage; |
| |
| // If this is a static declaration inside an inline function, it must have |
| // weak linkage so that the linker will merge multiple definitions of it. |
| if (getContext().getLangOptions().CPlusPlus) { |
| if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurFuncDecl)) { |
| if (FD->isInlined()) |
| Linkage = llvm::GlobalValue::WeakAnyLinkage; |
| } |
| } |
| |
| return EmitStaticBlockVarDecl(D, Linkage); |
| } |
| case VarDecl::Extern: |
| case VarDecl::PrivateExtern: |
| // Don't emit it now, allow it to be emitted lazily on its first use. |
| return; |
| } |
| |
| assert(0 && "Unknown storage class"); |
| } |
| |
| static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D, |
| const char *Separator) { |
| CodeGenModule &CGM = CGF.CGM; |
| if (CGF.getContext().getLangOptions().CPlusPlus) { |
| MangleBuffer Name; |
| CGM.getMangledName(Name, &D); |
| return Name.getString().str(); |
| } |
| |
| std::string ContextName; |
| if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CGF.CurFuncDecl)) { |
| MangleBuffer Name; |
| CGM.getMangledName(Name, FD); |
| ContextName = Name.getString().str(); |
| } else if (isa<ObjCMethodDecl>(CGF.CurFuncDecl)) |
| ContextName = CGF.CurFn->getName(); |
| else |
| // FIXME: What about in a block?? |
| assert(0 && "Unknown context for block var decl"); |
| |
| return ContextName + Separator + D.getNameAsString(); |
| } |
| |
| llvm::GlobalVariable * |
| CodeGenFunction::CreateStaticBlockVarDecl(const VarDecl &D, |
| const char *Separator, |
| llvm::GlobalValue::LinkageTypes Linkage) { |
| QualType Ty = D.getType(); |
| assert(Ty->isConstantSizeType() && "VLAs can't be static"); |
| |
| std::string Name = GetStaticDeclName(*this, D, Separator); |
| |
| const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty); |
| llvm::GlobalVariable *GV = |
| new llvm::GlobalVariable(CGM.getModule(), LTy, |
| Ty.isConstant(getContext()), Linkage, |
| CGM.EmitNullConstant(D.getType()), Name, 0, |
| D.isThreadSpecified(), Ty.getAddressSpace()); |
| GV->setAlignment(getContext().getDeclAlign(&D).getQuantity()); |
| return GV; |
| } |
| |
| /// AddInitializerToGlobalBlockVarDecl - Add the initializer for 'D' to the |
| /// global variable that has already been created for it. If the initializer |
| /// has a different type than GV does, this may free GV and return a different |
| /// one. Otherwise it just returns GV. |
| llvm::GlobalVariable * |
| CodeGenFunction::AddInitializerToGlobalBlockVarDecl(const VarDecl &D, |
| llvm::GlobalVariable *GV) { |
| llvm::Constant *Init = CGM.EmitConstantExpr(D.getInit(), D.getType(), this); |
| |
| // If constant emission failed, then this should be a C++ static |
| // initializer. |
| if (!Init) { |
| if (!getContext().getLangOptions().CPlusPlus) |
| CGM.ErrorUnsupported(D.getInit(), "constant l-value expression"); |
| else { |
| // Since we have a static initializer, this global variable can't |
| // be constant. |
| GV->setConstant(false); |
| |
| EmitStaticCXXBlockVarDeclInit(D, GV); |
| } |
| return GV; |
| } |
| |
| // The initializer may differ in type from the global. Rewrite |
| // the global to match the initializer. (We have to do this |
| // because some types, like unions, can't be completely represented |
| // in the LLVM type system.) |
| if (GV->getType() != Init->getType()) { |
| llvm::GlobalVariable *OldGV = GV; |
| |
| GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(), |
| OldGV->isConstant(), |
| OldGV->getLinkage(), Init, "", |
| 0, D.isThreadSpecified(), |
| D.getType().getAddressSpace()); |
| |
| // Steal the name of the old global |
| GV->takeName(OldGV); |
| |
| // Replace all uses of the old global with the new global |
| llvm::Constant *NewPtrForOldDecl = |
| llvm::ConstantExpr::getBitCast(GV, OldGV->getType()); |
| OldGV->replaceAllUsesWith(NewPtrForOldDecl); |
| |
| // Erase the old global, since it is no longer used. |
| OldGV->eraseFromParent(); |
| } |
| |
| GV->setInitializer(Init); |
| return GV; |
| } |
| |
| void CodeGenFunction::EmitStaticBlockVarDecl(const VarDecl &D, |
| llvm::GlobalValue::LinkageTypes Linkage) { |
| // Bail out early if the block is unreachable. |
| if (!Builder.GetInsertBlock()) return; |
| |
| llvm::Value *&DMEntry = LocalDeclMap[&D]; |
| assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); |
| |
| llvm::GlobalVariable *GV = CreateStaticBlockVarDecl(D, ".", Linkage); |
| |
| // Store into LocalDeclMap before generating initializer to handle |
| // circular references. |
| DMEntry = GV; |
| if (getContext().getLangOptions().CPlusPlus) |
| CGM.setStaticLocalDeclAddress(&D, GV); |
| |
| // Make sure to evaluate VLA bounds now so that we have them for later. |
| // |
| // FIXME: Can this happen? |
| if (D.getType()->isVariablyModifiedType()) |
| EmitVLASize(D.getType()); |
| |
| // If this value has an initializer, emit it. |
| if (D.getInit()) |
| GV = AddInitializerToGlobalBlockVarDecl(D, GV); |
| |
| GV->setAlignment(getContext().getDeclAlign(&D).getQuantity()); |
| |
| // FIXME: Merge attribute handling. |
| if (const AnnotateAttr *AA = D.getAttr<AnnotateAttr>()) { |
| SourceManager &SM = CGM.getContext().getSourceManager(); |
| llvm::Constant *Ann = |
| CGM.EmitAnnotateAttr(GV, AA, |
| SM.getInstantiationLineNumber(D.getLocation())); |
| CGM.AddAnnotation(Ann); |
| } |
| |
| if (const SectionAttr *SA = D.getAttr<SectionAttr>()) |
| GV->setSection(SA->getName()); |
| |
| if (D.hasAttr<UsedAttr>()) |
| CGM.AddUsedGlobal(GV); |
| |
| // We may have to cast the constant because of the initializer |
| // mismatch above. |
| // |
| // FIXME: It is really dangerous to store this in the map; if anyone |
| // RAUW's the GV uses of this constant will be invalid. |
| const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(D.getType()); |
| const llvm::Type *LPtrTy = |
| llvm::PointerType::get(LTy, D.getType().getAddressSpace()); |
| DMEntry = llvm::ConstantExpr::getBitCast(GV, LPtrTy); |
| |
| // Emit global variable debug descriptor for static vars. |
| CGDebugInfo *DI = getDebugInfo(); |
| if (DI) { |
| DI->setLocation(D.getLocation()); |
| DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(GV), &D); |
| } |
| } |
| |
| unsigned CodeGenFunction::getByRefValueLLVMField(const ValueDecl *VD) const { |
| assert(ByRefValueInfo.count(VD) && "Did not find value!"); |
| |
| return ByRefValueInfo.find(VD)->second.second; |
| } |
| |
| /// BuildByRefType - This routine changes a __block variable declared as T x |
| /// into: |
| /// |
| /// struct { |
| /// void *__isa; |
| /// void *__forwarding; |
| /// int32_t __flags; |
| /// int32_t __size; |
| /// void *__copy_helper; // only if needed |
| /// void *__destroy_helper; // only if needed |
| /// char padding[X]; // only if needed |
| /// T x; |
| /// } x |
| /// |
| const llvm::Type *CodeGenFunction::BuildByRefType(const ValueDecl *D) { |
| std::pair<const llvm::Type *, unsigned> &Info = ByRefValueInfo[D]; |
| if (Info.first) |
| return Info.first; |
| |
| QualType Ty = D->getType(); |
| |
| std::vector<const llvm::Type *> Types; |
| |
| const llvm::PointerType *Int8PtrTy = llvm::Type::getInt8PtrTy(VMContext); |
| |
| llvm::PATypeHolder ByRefTypeHolder = llvm::OpaqueType::get(VMContext); |
| |
| // void *__isa; |
| Types.push_back(Int8PtrTy); |
| |
| // void *__forwarding; |
| Types.push_back(llvm::PointerType::getUnqual(ByRefTypeHolder)); |
| |
| // int32_t __flags; |
| Types.push_back(llvm::Type::getInt32Ty(VMContext)); |
| |
| // int32_t __size; |
| Types.push_back(llvm::Type::getInt32Ty(VMContext)); |
| |
| bool HasCopyAndDispose = BlockRequiresCopying(Ty); |
| if (HasCopyAndDispose) { |
| /// void *__copy_helper; |
| Types.push_back(Int8PtrTy); |
| |
| /// void *__destroy_helper; |
| Types.push_back(Int8PtrTy); |
| } |
| |
| bool Packed = false; |
| CharUnits Align = getContext().getDeclAlign(D); |
| if (Align > CharUnits::fromQuantity(Target.getPointerAlign(0) / 8)) { |
| // We have to insert padding. |
| |
| // The struct above has 2 32-bit integers. |
| unsigned CurrentOffsetInBytes = 4 * 2; |
| |
| // And either 2 or 4 pointers. |
| CurrentOffsetInBytes += (HasCopyAndDispose ? 4 : 2) * |
| CGM.getTargetData().getTypeAllocSize(Int8PtrTy); |
| |
| // Align the offset. |
| unsigned AlignedOffsetInBytes = |
| llvm::RoundUpToAlignment(CurrentOffsetInBytes, Align.getQuantity()); |
| |
| unsigned NumPaddingBytes = AlignedOffsetInBytes - CurrentOffsetInBytes; |
| if (NumPaddingBytes > 0) { |
| const llvm::Type *Ty = llvm::Type::getInt8Ty(VMContext); |
| // FIXME: We need a sema error for alignment larger than the minimum of |
| // the maximal stack alignmint and the alignment of malloc on the system. |
| if (NumPaddingBytes > 1) |
| Ty = llvm::ArrayType::get(Ty, NumPaddingBytes); |
| |
| Types.push_back(Ty); |
| |
| // We want a packed struct. |
| Packed = true; |
| } |
| } |
| |
| // T x; |
| Types.push_back(ConvertType(Ty)); |
| |
| const llvm::Type *T = llvm::StructType::get(VMContext, Types, Packed); |
| |
| cast<llvm::OpaqueType>(ByRefTypeHolder.get())->refineAbstractTypeTo(T); |
| CGM.getModule().addTypeName("struct.__block_byref_" + D->getNameAsString(), |
| ByRefTypeHolder.get()); |
| |
| Info.first = ByRefTypeHolder.get(); |
| |
| Info.second = Types.size() - 1; |
| |
| return Info.first; |
| } |
| |
| /// EmitLocalBlockVarDecl - Emit code and set up an entry in LocalDeclMap for a |
| /// variable declaration with auto, register, or no storage class specifier. |
| /// These turn into simple stack objects, or GlobalValues depending on target. |
| void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) { |
| QualType Ty = D.getType(); |
| bool isByRef = D.hasAttr<BlocksAttr>(); |
| bool needsDispose = false; |
| CharUnits Align = CharUnits::Zero(); |
| bool IsSimpleConstantInitializer = false; |
| |
| llvm::Value *DeclPtr; |
| if (Ty->isConstantSizeType()) { |
| if (!Target.useGlobalsForAutomaticVariables()) { |
| |
| // If this value is an array or struct, is POD, and if the initializer is |
| // a staticly determinable constant, try to optimize it. |
| if (D.getInit() && !isByRef && |
| (Ty->isArrayType() || Ty->isRecordType()) && |
| Ty->isPODType() && |
| D.getInit()->isConstantInitializer(getContext())) { |
| // If this variable is marked 'const', emit the value as a global. |
| if (CGM.getCodeGenOpts().MergeAllConstants && |
| Ty.isConstant(getContext())) { |
| EmitStaticBlockVarDecl(D, llvm::GlobalValue::InternalLinkage); |
| return; |
| } |
| |
| IsSimpleConstantInitializer = true; |
| } |
| |
| // A normal fixed sized variable becomes an alloca in the entry block. |
| const llvm::Type *LTy = ConvertTypeForMem(Ty); |
| if (isByRef) |
| LTy = BuildByRefType(&D); |
| llvm::AllocaInst *Alloc = CreateTempAlloca(LTy); |
| Alloc->setName(D.getNameAsString()); |
| |
| Align = getContext().getDeclAlign(&D); |
| if (isByRef) |
| Align = std::max(Align, |
| CharUnits::fromQuantity(Target.getPointerAlign(0) / 8)); |
| Alloc->setAlignment(Align.getQuantity()); |
| DeclPtr = Alloc; |
| } else { |
| // Targets that don't support recursion emit locals as globals. |
| const char *Class = |
| D.getStorageClass() == VarDecl::Register ? ".reg." : ".auto."; |
| DeclPtr = CreateStaticBlockVarDecl(D, Class, |
| llvm::GlobalValue |
| ::InternalLinkage); |
| } |
| |
| // FIXME: Can this happen? |
| if (Ty->isVariablyModifiedType()) |
| EmitVLASize(Ty); |
| } else { |
| EnsureInsertPoint(); |
| |
| if (!DidCallStackSave) { |
| // Save the stack. |
| const llvm::Type *LTy = llvm::Type::getInt8PtrTy(VMContext); |
| llvm::Value *Stack = CreateTempAlloca(LTy, "saved_stack"); |
| |
| llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave); |
| llvm::Value *V = Builder.CreateCall(F); |
| |
| Builder.CreateStore(V, Stack); |
| |
| DidCallStackSave = true; |
| |
| { |
| // Push a cleanup block and restore the stack there. |
| DelayedCleanupBlock scope(*this); |
| |
| V = Builder.CreateLoad(Stack, "tmp"); |
| llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stackrestore); |
| Builder.CreateCall(F, V); |
| } |
| } |
| |
| // Get the element type. |
| const llvm::Type *LElemTy = ConvertTypeForMem(Ty); |
| const llvm::Type *LElemPtrTy = |
| llvm::PointerType::get(LElemTy, D.getType().getAddressSpace()); |
| |
| llvm::Value *VLASize = EmitVLASize(Ty); |
| |
| // Downcast the VLA size expression |
| VLASize = Builder.CreateIntCast(VLASize, llvm::Type::getInt32Ty(VMContext), |
| false, "tmp"); |
| |
| // Allocate memory for the array. |
| llvm::AllocaInst *VLA = |
| Builder.CreateAlloca(llvm::Type::getInt8Ty(VMContext), VLASize, "vla"); |
| VLA->setAlignment(getContext().getDeclAlign(&D).getQuantity()); |
| |
| DeclPtr = Builder.CreateBitCast(VLA, LElemPtrTy, "tmp"); |
| } |
| |
| llvm::Value *&DMEntry = LocalDeclMap[&D]; |
| assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); |
| DMEntry = DeclPtr; |
| |
| // Emit debug info for local var declaration. |
| if (CGDebugInfo *DI = getDebugInfo()) { |
| assert(HaveInsertPoint() && "Unexpected unreachable point!"); |
| |
| DI->setLocation(D.getLocation()); |
| if (Target.useGlobalsForAutomaticVariables()) { |
| DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(DeclPtr), &D); |
| } else |
| DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder); |
| } |
| |
| // If this local has an initializer, emit it now. |
| const Expr *Init = D.getInit(); |
| |
| // If we are at an unreachable point, we don't need to emit the initializer |
| // unless it contains a label. |
| if (!HaveInsertPoint()) { |
| if (!ContainsLabel(Init)) |
| Init = 0; |
| else |
| EnsureInsertPoint(); |
| } |
| |
| if (isByRef) { |
| const llvm::PointerType *PtrToInt8Ty = llvm::Type::getInt8PtrTy(VMContext); |
| |
| EnsureInsertPoint(); |
| llvm::Value *isa_field = Builder.CreateStructGEP(DeclPtr, 0); |
| llvm::Value *forwarding_field = Builder.CreateStructGEP(DeclPtr, 1); |
| llvm::Value *flags_field = Builder.CreateStructGEP(DeclPtr, 2); |
| llvm::Value *size_field = Builder.CreateStructGEP(DeclPtr, 3); |
| llvm::Value *V; |
| int flag = 0; |
| int flags = 0; |
| |
| needsDispose = true; |
| |
| if (Ty->isBlockPointerType()) { |
| flag |= BLOCK_FIELD_IS_BLOCK; |
| flags |= BLOCK_HAS_COPY_DISPOSE; |
| } else if (BlockRequiresCopying(Ty)) { |
| flag |= BLOCK_FIELD_IS_OBJECT; |
| flags |= BLOCK_HAS_COPY_DISPOSE; |
| } |
| |
| // FIXME: Someone double check this. |
| if (Ty.isObjCGCWeak()) |
| flag |= BLOCK_FIELD_IS_WEAK; |
| |
| int isa = 0; |
| if (flag&BLOCK_FIELD_IS_WEAK) |
| isa = 1; |
| V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), isa); |
| V = Builder.CreateIntToPtr(V, PtrToInt8Ty, "isa"); |
| Builder.CreateStore(V, isa_field); |
| |
| Builder.CreateStore(DeclPtr, forwarding_field); |
| |
| V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), flags); |
| Builder.CreateStore(V, flags_field); |
| |
| const llvm::Type *V1; |
| V1 = cast<llvm::PointerType>(DeclPtr->getType())->getElementType(); |
| V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| CGM.GetTargetTypeStoreSize(V1).getQuantity()); |
| Builder.CreateStore(V, size_field); |
| |
| if (flags & BLOCK_HAS_COPY_DISPOSE) { |
| BlockHasCopyDispose = true; |
| llvm::Value *copy_helper = Builder.CreateStructGEP(DeclPtr, 4); |
| Builder.CreateStore(BuildbyrefCopyHelper(DeclPtr->getType(), flag, |
| Align.getQuantity()), |
| copy_helper); |
| |
| llvm::Value *destroy_helper = Builder.CreateStructGEP(DeclPtr, 5); |
| Builder.CreateStore(BuildbyrefDestroyHelper(DeclPtr->getType(), flag, |
| Align.getQuantity()), |
| destroy_helper); |
| } |
| } |
| |
| if (Init) { |
| llvm::Value *Loc = DeclPtr; |
| if (isByRef) |
| Loc = Builder.CreateStructGEP(DeclPtr, getByRefValueLLVMField(&D), |
| D.getNameAsString()); |
| |
| bool isVolatile = |
| getContext().getCanonicalType(D.getType()).isVolatileQualified(); |
| |
| // If the initializer was a simple constant initializer, we can optimize it |
| // in various ways. |
| if (IsSimpleConstantInitializer) { |
| llvm::Constant *Init = CGM.EmitConstantExpr(D.getInit(),D.getType(),this); |
| assert(Init != 0 && "Wasn't a simple constant init?"); |
| |
| llvm::Value *AlignVal = |
| llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), |
| Align.getQuantity()); |
| const llvm::Type *IntPtr = |
| llvm::IntegerType::get(VMContext, LLVMPointerWidth); |
| llvm::Value *SizeVal = |
| llvm::ConstantInt::get(IntPtr, |
| getContext().getTypeSizeInChars(Ty).getQuantity()); |
| |
| const llvm::Type *BP = llvm::Type::getInt8PtrTy(VMContext); |
| if (Loc->getType() != BP) |
| Loc = Builder.CreateBitCast(Loc, BP, "tmp"); |
| |
| llvm::Value *NotVolatile = |
| llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), 0); |
| |
| // If the initializer is all zeros, codegen with memset. |
| if (isa<llvm::ConstantAggregateZero>(Init)) { |
| llvm::Value *Zero = |
| llvm::ConstantInt::get(llvm::Type::getInt8Ty(VMContext), 0); |
| Builder.CreateCall5(CGM.getMemSetFn(Loc->getType(), SizeVal->getType()), |
| Loc, Zero, SizeVal, AlignVal, NotVolatile); |
| } else { |
| // Otherwise, create a temporary global with the initializer then |
| // memcpy from the global to the alloca. |
| std::string Name = GetStaticDeclName(*this, D, "."); |
| llvm::GlobalVariable *GV = |
| new llvm::GlobalVariable(CGM.getModule(), Init->getType(), true, |
| llvm::GlobalValue::InternalLinkage, |
| Init, Name, 0, false, 0); |
| GV->setAlignment(Align.getQuantity()); |
| |
| llvm::Value *SrcPtr = GV; |
| if (SrcPtr->getType() != BP) |
| SrcPtr = Builder.CreateBitCast(SrcPtr, BP, "tmp"); |
| |
| Builder.CreateCall5(CGM.getMemCpyFn(Loc->getType(), SrcPtr->getType(), |
| SizeVal->getType()), |
| Loc, SrcPtr, SizeVal, AlignVal, NotVolatile); |
| } |
| } else if (Ty->isReferenceType()) { |
| RValue RV = EmitReferenceBindingToExpr(Init, /*IsInitializer=*/true); |
| EmitStoreOfScalar(RV.getScalarVal(), Loc, false, Ty); |
| } else if (!hasAggregateLLVMType(Init->getType())) { |
| llvm::Value *V = EmitScalarExpr(Init); |
| EmitStoreOfScalar(V, Loc, isVolatile, D.getType()); |
| } else if (Init->getType()->isAnyComplexType()) { |
| EmitComplexExprIntoAddr(Init, Loc, isVolatile); |
| } else { |
| EmitAggExpr(Init, Loc, isVolatile); |
| } |
| } |
| |
| // Handle CXX destruction of variables. |
| QualType DtorTy(Ty); |
| while (const ArrayType *Array = getContext().getAsArrayType(DtorTy)) |
| DtorTy = getContext().getBaseElementType(Array); |
| if (const RecordType *RT = DtorTy->getAs<RecordType>()) |
| if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) { |
| if (!ClassDecl->hasTrivialDestructor()) { |
| const CXXDestructorDecl *D = ClassDecl->getDestructor(getContext()); |
| assert(D && "EmitLocalBlockVarDecl - destructor is nul"); |
| |
| if (const ConstantArrayType *Array = |
| getContext().getAsConstantArrayType(Ty)) { |
| { |
| DelayedCleanupBlock Scope(*this); |
| QualType BaseElementTy = getContext().getBaseElementType(Array); |
| const llvm::Type *BasePtr = ConvertType(BaseElementTy); |
| BasePtr = llvm::PointerType::getUnqual(BasePtr); |
| llvm::Value *BaseAddrPtr = |
| Builder.CreateBitCast(DeclPtr, BasePtr); |
| EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr); |
| |
| // Make sure to jump to the exit block. |
| EmitBranch(Scope.getCleanupExitBlock()); |
| } |
| if (Exceptions) { |
| EHCleanupBlock Cleanup(*this); |
| QualType BaseElementTy = getContext().getBaseElementType(Array); |
| const llvm::Type *BasePtr = ConvertType(BaseElementTy); |
| BasePtr = llvm::PointerType::getUnqual(BasePtr); |
| llvm::Value *BaseAddrPtr = |
| Builder.CreateBitCast(DeclPtr, BasePtr); |
| EmitCXXAggrDestructorCall(D, Array, BaseAddrPtr); |
| } |
| } else { |
| { |
| DelayedCleanupBlock Scope(*this); |
| EmitCXXDestructorCall(D, Dtor_Complete, /*ForVirtualBase=*/false, |
| DeclPtr); |
| |
| // Make sure to jump to the exit block. |
| EmitBranch(Scope.getCleanupExitBlock()); |
| } |
| if (Exceptions) { |
| EHCleanupBlock Cleanup(*this); |
| EmitCXXDestructorCall(D, Dtor_Complete, /*ForVirtualBase=*/false, |
| DeclPtr); |
| } |
| } |
| } |
| } |
| |
| // Handle the cleanup attribute |
| if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) { |
| const FunctionDecl *FD = CA->getFunctionDecl(); |
| |
| llvm::Constant* F = CGM.GetAddrOfFunction(FD); |
| assert(F && "Could not find function!"); |
| |
| const CGFunctionInfo &Info = CGM.getTypes().getFunctionInfo(FD); |
| |
| // In some cases, the type of the function argument will be different from |
| // the type of the pointer. An example of this is |
| // void f(void* arg); |
| // __attribute__((cleanup(f))) void *g; |
| // |
| // To fix this we insert a bitcast here. |
| QualType ArgTy = Info.arg_begin()->type; |
| { |
| DelayedCleanupBlock scope(*this); |
| |
| CallArgList Args; |
| Args.push_back(std::make_pair(RValue::get(Builder.CreateBitCast(DeclPtr, |
| ConvertType(ArgTy))), |
| getContext().getPointerType(D.getType()))); |
| EmitCall(Info, F, ReturnValueSlot(), Args); |
| } |
| if (Exceptions) { |
| EHCleanupBlock Cleanup(*this); |
| |
| CallArgList Args; |
| Args.push_back(std::make_pair(RValue::get(Builder.CreateBitCast(DeclPtr, |
| ConvertType(ArgTy))), |
| getContext().getPointerType(D.getType()))); |
| EmitCall(Info, F, ReturnValueSlot(), Args); |
| } |
| } |
| |
| if (needsDispose && CGM.getLangOptions().getGCMode() != LangOptions::GCOnly) { |
| { |
| DelayedCleanupBlock scope(*this); |
| llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding"); |
| V = Builder.CreateLoad(V); |
| BuildBlockRelease(V); |
| } |
| // FIXME: Turn this on and audit the codegen |
| if (0 && Exceptions) { |
| EHCleanupBlock Cleanup(*this); |
| llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding"); |
| V = Builder.CreateLoad(V); |
| BuildBlockRelease(V); |
| } |
| } |
| } |
| |
| /// Emit an alloca (or GlobalValue depending on target) |
| /// for the specified parameter and set up LocalDeclMap. |
| void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg) { |
| // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl? |
| assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) && |
| "Invalid argument to EmitParmDecl"); |
| QualType Ty = D.getType(); |
| CanQualType CTy = getContext().getCanonicalType(Ty); |
| |
| llvm::Value *DeclPtr; |
| // If this is an aggregate or variable sized value, reuse the input pointer. |
| if (!Ty->isConstantSizeType() || |
| CodeGenFunction::hasAggregateLLVMType(Ty)) { |
| DeclPtr = Arg; |
| } else { |
| // Otherwise, create a temporary to hold the value. |
| DeclPtr = CreateMemTemp(Ty, D.getName() + ".addr"); |
| |
| // Store the initial value into the alloca. |
| EmitStoreOfScalar(Arg, DeclPtr, CTy.isVolatileQualified(), Ty); |
| } |
| Arg->setName(D.getName()); |
| |
| llvm::Value *&DMEntry = LocalDeclMap[&D]; |
| assert(DMEntry == 0 && "Decl already exists in localdeclmap!"); |
| DMEntry = DeclPtr; |
| |
| // Emit debug info for param declaration. |
| if (CGDebugInfo *DI = getDebugInfo()) { |
| DI->setLocation(D.getLocation()); |
| DI->EmitDeclareOfArgVariable(&D, DeclPtr, Builder); |
| } |
| } |